Step 1: The Design
The racks are spaced 11 and 7/8th inch from the top of one to the bottom of the next rack. NOT on center
The cut holding the top of the records is made even by keeping the saw in the same position and rotating the wood stock. remove the remaining stock by adjusting the cut and flipping as nessasary. It took me 5 passes total.
The side supporting the bottom of the record is done with two passes one vertical and the other at 45. I did not move the position of the back stop I only flipped the stock and raised the blade a bit for the 45° cut but this might be different on your table saw.
The way I mounted mine was directly to a stud with a single screw at the center remember when drilling holes that studs are typically 16 inches apart
Another more discreet mounting idea would be a keyhole hanger but I could not find the hardware at my local store.
Customize your design and Happy building!